His family and that of his fiancée Stephanie Anderson have now issued a statement to People revealing more details.

The statement says that the fall happened after Poueu found himself trapped on an apartment rooftop following a friend's birthday dinner when a door locked behind him

"[He] attempted to climb down the fire escape ladder to drop down into the fourth floor balcony and slipped," it reads. "The San Francisco Fire Department responded within minutes thanks to a neighbor's immediate call."

The statement continues to say that Poueu has "made positive and encouraging strides" since the accident, which left him with "many serious internal injuries and a trauma to the right side of his head".

"Since being admitted to the hospital, Sam has stayed strong through three surgeries," it adds. "To date, many of his internal injuries are on the healing mend."

Biggest Loser trainer Bob Harper and host Alison Sweeney are among those who have sent their well-wishes to Poueu via Twitter.